Halt - Go No Further.

The “golf balls,” or radomes, dwarf the buildings at this U.S. military base in North Yorkshire. They house satellite receivers and transmitters that help Menwith Hill’s workers fulfill the mission of providing “intelligence support for U.K., U.S. and allied interests,” according to the base website.
Whatever they are doing - I couldn't find a good place for a blip - CCTV, fences, barbed wire all over the place.

Lately, installations such as Menwith Hill have come under scrutiny and criticism, following disclosures made by National Security Agency leaker Edward Snowden that the U.S. was using NSA surveillance programs to secretly gather information about phone calls and Internet communications worldwide.

They do generate strong feelings - both for and against. They just fascinate me :-)